For example, it is useful to have one field that controls the ALU and a set of three fields that determine the two sources for the ALU operation as well as the destination of the ALU result. In addition to readability, the microprogram format should make it difficult or impossible to ...
The parameters may, for example, be derived from the current machine-level instruction. In a preferred form of the invention, the apparatus comprises a plurality of separate functional units, each unit having a separate microprogram store and decoder associated with it, and the parameters are fed...
It may be that breakout is required when certain states occur in the processor to be controlled as for example in division when the resultant from the ALU is negative. The provision of a suitable testing mechanism can also handle what can be termed "extraordinary events" such as a detected ...
Central processor units respond to machine level instructions. Each machine level instruction has an operation code and may have an operand address. In order to process the instruction, the central processor unit must perform a series of internal data transfers. For example, the contents of a prog...